Electrical conductor.



P. P. NUN GB SSER. ELBGTBIOAL 'connnowoa.

APPLICATION rum) mm. 5, 1913. i 1,090,872 Patented Mar. 24, 1914 k flexibleconnection or conductor to a large percenta o (l nd the block. However,

the block, and Fi s'rA'rEs PA ENT OFFICE.

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To all-whom it may concern Be .it knownthat I P1nmr P. Nuncnssnn, a citiz'errofthe United States, residing at Cleveland, in the county of Cuyahoga and Stateof Ohio, have invented certain new and useful Improvements in Electrical ,Conductors, of: which the following is aspecification.

This invention relates to electrical conductors, and-.inoi'e' particularly to brushes for electric machines, the invention residing in the new and novel means for securin a the so id body of the brush, substantially as herein shown and described and more particularly pointed out in the claims. 1

In securing a flexible connection to the solid body of a brush, a good electrical bond is the first consideration. In the resent invention such' a bond-is mechanica 1y obtained by compressing the connection against as the body of a brush of this kind is usually composed of carbon or copper and graphite or other friable or breakable material, the strains of compression must be carefull distributed, otherwise blocks will be split or broken and ten absolutely useless. To eliminate this trouble and expense, I rovide a very compact and simple form screw fastener for the flexible connection which will distribute the strains of GOIHPIQSSIOII' uniformly over a localized area and in pargh the block; in brief, op-

allel lines throu crating in eflect in direct contra-distinction to tapered or wedge-shaped devices which strains upon the block. In the accompanying drawing, Figure 1 is a perspective view of a brush embodying my invention. Fig. 2-is a sectional view of 8 a sectional and side impose cleavage view of the block with the flexible connection device. Fig. 4;

ination of materials tncal conductivit secured in place by my improved fastening is a perspective view of the flexible connection showing a looped end. Fig. 5 is a. perspective view of the concaved nut, and'Fig. 6 a similar view of the screw.

The electrical conductor or brush comprises a solid body 2 of carbon, carbon and phite, copper, or of any material or coman having self-lubricatmg properties.

bore 4 transversely thereo near its upper ELECTBICAL QONDUCTOB.

Specification ofihetters Patent. 1 lAppllcation filed December 5, 1918. Serial No. 804.803.

-: ing a high elec-' 8, the strains of compression upon y 8 is rovided with a Assumes. To run nuuonssnn. cannon 01110, A coaroaa'rrou or 0x10.

Patented Mar. 24, 1914.

end to receive a clamping deviceconsisting or a headed screw 5 and a round nut 6. The

recesses or enlarged portions 7 and 8 ofthe 3 bore 4 are relatively shallow but of unequal depth and of the same recesses have flat bottoms 9 allel plane relatively to rightangles to the axis of the bore...3. The round flat head 10 of the screw is relatively thin and substantially equal in thickness to the depth of recess 7 'in block 2, which brings the outside kerfcd tially flush with the side face of the block,

diameter, and both in the same parl one another and at face of said headsubstan and the bottom or inside face of head/ 10 is fiat to correspond with recess.

The head 10 is relatively much larger in diameter than the threaded stem of the screw to provide a wide bearing surface corresponding with recess-bottom 9 in the brush body, and the round nut 6 isalso relatively large in diameter to provide '8' wide seat for the loop 11 at flexible conductor 3. solder or coated with an amalgam before placement in the bottom of recess 8, andthe main portion of the. connection extends passage or opening 12 through the inclined which opens into the bottom of recess 8 at one side of the smaller portion of bore 4. Theinner face of nut 6 is particularly distinguished in that it is concaved or dished, and the concavity 14 is preferably circular and rounded, or'in other words,:it is-an endless. channel with a rounded surface andwith its greatest depth centrally between the periphery of the nut and the central-"screw opening 15. 'Theadvanta e of this forma-' tion of nut is, first, that t e end or loop of the connection 3 is crowded to the center of the channel in the face of the nut andv not spread outwardly against the annular wall of recess 8, and, second, the stock in the center of the nut is preserved for the greatest maximum number of threads in a nut of a given thickness,-which at best is very small in brushes for small electric machines. Moreover, the concaved channel 14 localizes all the pressure upon the loop 11 in a circumscribed area at the bottom of the recess the body 2 being in straight lines runnin parallel with the stem of the screw and ,t e axis of bore 3 and within the radius encompassed or the bottom of th p I 70,

the end of the i Loop 11 is dippedfi'n so i I is also relatively large,.very little material t and a pair ofclamping members to clamp defined by head 5 of the screw. Therefore, the connection 3 may be clamped or fastened to the solid body 2 under considerable pressure without splitting or breaking said body, and the mechanical and electricalbond which a is obtained is of the highest possible efprovided with a ficiency. The amount of stock in the block ofone of 2 between the nut and the head of the screw a flexible metallic conductor and a headed screw and nut and bore, said nut having a channeled face flexible connection and center the strains of compression .in the body about said screw.

4. electrical conductor comprising ,a vsolid body having shallow side recesses'and communicating bore therebetween and an 8 are relatively hallow and the head 5 of the screw and the body of nut 6 are relatively thin. Nut 6 hasa kerf or slot 17 for screw-driver engagement, and when the parts are assembled and tightly fastened together with the outer faces of the screw head 5 andfthe nut 6 either flush or below the level of the sides of the body 2. the fastening maybe made permanent b upsetting or centelfimching the end I8 of the screw stem.

at I c aim is:

1. An electrical conductor, comprisi a solid body, a flexible metallic connection,

5. An electrical conductor, solid body having intersecting' passages therein, a flexible '-me tallic gonnection extending through one of-saidf passages and having a looped end, a scre I pein displaced, particnlarlyoas the recesses passage, and a. nut having'a central screwthreaded o ening and a rounded channeled clamping ace opposite said looped lend of said flexible connection.

6. An electrical solid brush body relatively shallow recesses at the respective ends of said passage,fsaid recesses having fiat bottoms at: right anglesto the axis of said passage, and said body being provided with a second passage open to one: of said said connection upon said body, one of said members hav 1ng a concaved clamping face to engage said connection and localize the pressure in a circumscribed area of said w having arela-l tively large head seated within 'the other.

passage open to the bottom 1 said recesses, in combination with in said passage,

in said recesses .59 to seat the confined end of said connection. v I comprising a conductor comprisinga havmg a cross passage and" 1 body. recesses, in combination with a flexible me- 2 An electrical conductor, compr1s1n a tallic connection having a loop, a screw hav- Solid body, a flexible metallic connection, ing a relatively thin head, and a nut for said Copies screw having a, rounded circular channel in and a pair of clamping members comprising one face to seat said loop.

solid body having an opening for a clamping in presence of two witnesses,

- PHILIP r. NUNGESSER.

screw, a flexible connection, a' clamping VVitnessesi screw, and a nut having a clamping face R; B. Mosnn, prov ded with a clroular channel to seat said E. M. FIsHnR.

a Washington, D. 0.

Intestimony whereof I ,aflix' my signature I of this patent may be obtained for live cents each, by addressing the Commissioner oi l'atentl, 

